body{
    font-family: 'microsoft yahei',Verdana,Arial,Helvetica,sans-serif;
    font-size:12px;
    color: #ffffff;
}
.header{
    width: 100%;
    float: left;
}
.header .header_top{
    width: 100%;
    height: 50px;
    border-bottom: 1px solid #cccccc;
    border-top: 1px solid #cccccc;
}
.header .header_nav{
    width: 100%;
    height: 50px;
    border-bottom: 1px solid #cccccc;
    border-top: 1px solid #cccccc;
}
.header .header_nav ul{
    list-style: none;
}
.header .header_nav ul li{
    display: inline-block;
    float: left;
}
.header .main{
    min-width: 300px;
    max-width: 640px;
    height: 250px;
    mragin:0 auto;
}
.header .main .content{
    width: 100px;
    height: 100px;
    background-color: #151515;
    position: relative;
    margin: 75px auto;
}
.header .main .content img{
    position:absolute;
    width: 70px;
    height: 70px;
    z-index: 9999;
    left: 15px;
}
.header .main .content p{
    position: absolute;
    top: 70px;
    left: 25px;
}